A client use this operation to pull next event sequence of maximum length
MaxEvents. This operation is blocking and will not reply until the
requested amount of events can be delivered or the QoS property PacingInterval
is reached. For more information see the User's Guide.

This operation pulls an event sequence of the maximum length MaxEvents,
but do not block if the target object have no events to forward. The outparameter,
HasEvent is true if the sequence contain any events.